hate to sound like a broken record, but a QT tank is essential!
I wish 200 was all that i had a t risk. Imagine this, a sick fish gets into yoru tank, then you have the disease or parasite in the tank, you cannot treat it in there! Your corals, LS and LR are all at stake! NOT just that one fish, or its buddies. Most meds can be detrimental to corals and inverts on your rock. Go to walmart and buy their 40 or 50 dollar special with cheap filter and cheap lighting included. It is all that you need, but that 50 bucks or less will save you from the sart. And keep on saving you. NEVER EVER trust a LFS that says they quarentine their fish either, even if they do, the move from their tank to yours can induce stress, as well as the fact taht any fish at any time can become ill and hey just missed it, for whatever reason. Sure, some places do guraentee their fish, but waht about the rest of your tank. Is it really worth it over 50 dollars(or less)? Tha is merely the cost of one shrimp and one cheap fish, so all it sets you back is one trip to buy stock at your LFS.
AND NEVER QT in your sump or fuge!!! EVER! The idea of a qt tank is to keep that stuff OUT of the system completely. The disease, the parasite(whcih does move around in the water column and is the most commmon) and the MEDS.
sand and a couple more powerheads. if you like, a wave maker is not a bad idea either.